Acarospora otagensis

Detailed description

Thallus dull greenish-brown to red-brown, rather leathery, cracked into rather thick (0.2-0.5 mm) angular, areolae; areolae very irregular, centrally separated by deep cracks, rounded sublobulate at margins, ± convex, 0.5-1.2 mm diam., cortex C+ red. Apothecia very small, sunken, 2-3 per areola, 0.3-0.6 mm diam., disc red-brown, matt epruinose. Ascospores minute, ellipsoid to cylindrical, 100-200 per ascus, 3.5-5 × 1.5 µm.